Real time measurement of plasma macroscopic parameters on RFX-mod using a limited set of sensors

Ondrej Kudlacek, Paolo Zanca, Claudio Finotti, Giuseppe Marchiori, Roberto Cavazzana, Lionello Marrelli

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Abstract

A method to estimate the plasma boundary and global parameters such as βp+li/2 and the edge safety factor q95is described. The method is based on poloidal flux extrapolation in the vacuum region between the plasma and the magnetic measurements, and it is efficient and accurate even if a limited set of sensors is used. The discrepancy between the plasma boundary provided by this method and the boundary computed by the Grad-Shafranov solver MAXFEA is lower than 8 mm in all the considered cases. Moreover, the method is robust against the noise level present in the RFX-mod measurements. The difference between the estimated global parameters and the MAXFEA simulation results is lower than 4%. The method was finally implemented in the RFX-mod shape control system, working at 5 kHz cycle frequency, to provide a reliable set of plasma-wall distances (gaps) used as feedback signals. Experimental results obtained in one year of RFX-mod operation are shown.
Original languageEnglish
Article number102503
Pages (from-to)-
JournalPhysics of Plasmas
Volume22
Issue number10
DOIs
Publication statusPublished - 1 Oct 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Kudlacek, O., Zanca, P., Finotti, C., Marchiori, G., Cavazzana, R., & Marrelli, L. (2015). Real time measurement of plasma macroscopic parameters on RFX-mod using a limited set of sensors. Physics of Plasmas, 22(10), -. [102503]. https://doi.org/10.1063/1.4932992